<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>权限管理</el-breadcrumb-item>
          <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片试图区域 -->   
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 下拉菜单区域 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                            <!-- 一级权限 -->
                            <el-col :span="5">
                                <el-tag closable v-on:close='removeRightById(scope.row,item1.id)' >{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 二级权限渲染 -->
                                <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag closable v-on:close='removeRightById(scope.row,item2.id)' type="success">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 三级权限 -->
                                    <el-col :span="18">
                                        <el-tag closable v-on:close='removeRightById(scope.row,item3.id)' type="warning" v-for="(item3,i3) in item2.children" :key="item3.id">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                                
                            </el-col>

                        </el-row>
                        
                    </template>
                </el-table-column>
                <!-- 列表展示区域 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                    <!-- 操作表格区域 -->
                <el-table-column label="操作">
                    <template slot-scope="scope">
                         <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                         <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                         <el-button size="mini" type="warning" icon="el-icon-setting" v-on:click='showSetRightDialog(scope.row)'>分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" v-on:close='setRightDialogClosed'>
            <!-- 树形控件 -->
            <el-tree ref="treeRef" :data="rightslist" :props="treetProps" show-checkbox node-key='id' default-expand-all :default-checked-keys='defKeys'></el-tree>

            <!-- 底部按钮区域 -->
            <span slot="footer" class="dialog-footer">
              <el-button @click="setRightDialogVisible = false">取 消</el-button>
              <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            rolelist:[],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible:false,
            // 所有权限的数据
            rightslist:[],
            // 树形控件的属性绑定对象   
            treetProps:{
                children: 'children',
                label: 'authName'
            },
            // 默认选中的节点Id值数组
            defKeys:[],

            roleId:''
        };
    },
    created() {
        this.getRolesList()
    },
    mounted() {

    },
    methods: {
        getRolesList: async function(){
            const {data:res} = await this.$http.get('roles')
            if(res.meta.status !== 200){
                return this.$message.error('获取角色列表失败！')
            }
            this.rolelist = res.data
            
            this.$message.success('获取角色列表成功！')
            
        },
        removeRightById: async function(role, rightId){
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            if(confirmResult !== 'confirm'){
                return this.$message.info('取消删除')
            }
            // 确认删除后，发起axios请求
            const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

            if(res.meta.status !== 200 ){
                return this.$message.error('删除权限失败')
            }

            // 确认删除后，将响应回来的数据复制到scope.row.children,避免刷新全局页面
            role.children = res.data
            
        },
        showSetRightDialog: async function(role){
            // 把当前行的角色id存储到data中,分配权限的提交表单中使用
            this.roleId = role.id
            // 显示对话框之前要获取到权限数据
            const {data:res} = await this.$http.get(`rights/tree`)
            if(res.meta.status !== 200){
                return this.$message.error('获取权限列表失败')
            }
            this.rightslist = res.data
            //console.log(this.rightslist);
            // 显示对话框之前要把所有三级权限的默认id获取过来
            this.getLeafKeys(role,this.defKeys)

            // 然后显示对话框
            this.setRightDialogVisible = true
        },
        getLeafKeys:function(node,arr){
            if(!node.children){
                return arr.push(node.id)
            }
            node.children.forEach(item => {
                this.getLeafKeys(item,arr)
            });
        },
        setRightDialogClosed:function(){
            this.defKeys = []
        },
        allotRights: async function(){
            const keys = [
                // 获取全部选中的节点id
                ...this.$refs.treeRef.getCheckedKeys(),
                // 获取半选中的节点id
                ...this.$refs.treeRef.getHalfCheckedKeys()
            ]

            const idStr = keys.join(',')
            // 发起axios请求
            const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
            if(res.meta.status !== 200){
                return this.message.error('更新失败')
            }
            this.$message.success('更新成功')

            // 更新权限列表
            this.getRolesList()
            // 关闭对话框
            this.setRightDialogVisible = false
        }
    }
};
</script>

<style scoped lang="less">
.el-tag{
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom:1px solid #eeeeee 
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
